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How to tell if a AC Capacitor is Bad! Visual and Multimeter Testing!
WEBVTT Kind: captions Language: en
00:00:04.250 hey guys this is AC so respected today 00:00:06.95000:00:06.960 what I wanted to go over was what does a 00:00:09.08000:00:09.090 back pasture look like alright this 00:00:11.72000:00:11.730 particular capacitor was just pulled out 00:00:13.54900:00:13.559 of the 27 year old Florida heat pump I 00:00:15.62000:00:15.630 just found this the other night and it 00:00:17.54000:00:17.550 was leaking the dielectric solution all 00:00:20.21000:00:20.220 outside of the capacitor alright so the 00:00:22.84900:00:22.859 fluid is actually coming out and all 00:00:25.09900:00:25.109 over the place alright so you don't even 00:00:27.34900:00:27.359 need to test that that is bad just make 00:00:29.35900:00:29.369 sure you turn the power off you 00:00:30.41000:00:30.420 disconnect it and you replace it with 00:00:32.12000:00:32.130 Lakes Lake style capacitor with the same 00:00:36.08000:00:36.090 rating right this particular capacitor 00:00:39.59000:00:39.600 right here if you can make that out it's 00:00:42.13900:00:42.149 actually get like a mushroom top so 00:00:43.85000:00:43.860 basically the middle of it is pointed up 00:00:47.56900:00:47.579 right here alright whenever you see that 00:00:50.70900:00:50.719 that is a bad capacitor as well or when 00:00:54.04900:00:54.059 it's on its way out another thing that 00:00:56.24000:00:56.250 you might see is you might see a all wet 00:00:58.63900:00:58.649 on the top right here and if nothing 00:01:00.56000:01:00.570 else is wet and the inside of it that 00:01:02.36000:01:02.370 much will compartment and it should not 00:01:04.36900:01:04.379 be then that capacitor is on its way out 00:01:07.25000:01:07.260 but this one has a mushroom top as well 00:01:09.35000:01:09.360 all right but it's just starting okay so 00:01:14.39000:01:14.400 those are all bad capacitors this one 00:01:16.96900:01:16.979 looks just find them all right so so you 00:01:21.35000:01:21.360 wouldn't have any visual on this telling 00:01:23.84000:01:23.850 you that it's bad so we're going to go 00:01:25.88000:01:25.890 ahead and test this one out all right 00:01:28.37000:01:28.380 this one is a forty plus five uf 00:01:31.88000:01:31.890 capacitor it's a 370 V AC all right so 00:01:35.84000:01:35.850 put your multimeter to MFD and you can 00:01:41.17900:01:41.189 short these at you want to short out not 00:01:43.39900:01:43.409 necessarily to drink all the voltage out 00:01:45.28900:01:45.299 because all of it for the most part 00:01:46.85000:01:46.860 should mainly be drained out from the 00:01:49.67000:01:49.680 last time the unit was turned off the 00:01:51.53000:01:51.540 compressor and fan will drawl most of 00:01:54.59000:01:54.600 the voltage out already but if there's 00:01:56.38900:01:56.399 just a little bit remaining we're going 00:01:58.34000:01:58.350 to short that just to make sure we have 00:02:00.20000:02:00.210 an accurate measurement with our 00:02:01.45900:02:01.469 multimeter the start capacitors the 00:02:03.70900:02:03.719 black capacitors those are the ones that 00:02:06.13900:02:06.149 would actually have voltage in them 00:02:07.99900:02:08.009 because they're cut out by relay while 00:02:11.57000:02:11.580 the unit's running 00:02:12.63000:02:12.640 but the capacitors normal run capacitors 00:02:15.71000:02:15.720 typically have the voltage drained out 00:02:18.24000:02:18.250 of them when the unit is shut off but 00:02:21.03000:02:21.040 just to confirm that we're always safe 00:02:22.83000:02:22.840 and everything we just scrape this and 00:02:24.54000:02:24.550 to make sure that our we're getting good 00:02:28.44000:02:28.450 reading with our multimeter so common to 00:02:31.05000:02:31.060 fan we should get five so here you 00:02:36.51000:02:36.520 should get five and left it you want to 00:02:40.68000:02:40.690 press your probes down real nice and 00:02:42.27000:02:42.280 hard 00:02:42.77000:02:42.780 alright and you see we are actually 00:02:45.12000:02:45.130 getting nope there we go 00:02:47.40000:02:47.410 point eight seven and see wanna leave 00:02:50.82000:02:50.830 your probes on there for maybe ten 00:02:52.50000:02:52.510 seconds press mineral or you know five 00:02:54.47900:02:54.489 to ten seconds make sure you making a 00:02:55.89000:02:55.900 good electrical connection and that is 00:02:58.77000:02:58.780 nowhere near five MFT alright so it can 00:03:03.66000:03:03.670 be within five to six percent often it 00:03:06.66000:03:06.670 would still be okay so now we're going 00:03:08.22000:03:08.230 to go from home to common okay so we did 00:03:10.94900:03:10.959 fan to common and now we're going to go 00:03:12.66000:03:12.670 home to come alright 00:03:23.34000:03:23.350 once again you know you want to give it 00:03:25.72000:03:25.730 enough time to make sure you're reading 00:03:28.24000:03:28.250 the capacity we have 39.2 all right so 00:03:35.94000:03:35.950 39.2 is within six percent of what this 00:03:40.90000:03:40.910 capacitor is calling for so that side is 00:03:43.57000:03:43.580 still good but it's very very likely to 00:03:47.08000:03:47.090 fail very soon from now so you're going 00:03:51.04000:03:51.050 to replace this with another dual run 00:03:52.99000:03:53.000 capacitor that is 40 + 5 UF where you 00:03:56.35000:03:56.360 can replace it with a single capacitor 00:03:59.17000:03:59.180 that's 40 UF and then another single 00:04:01.54000:04:01.550 capacitor that's 5 you have you know 00:04:03.10000:04:03.110 five meaning for the fan and 40 for the 00:04:05.20000:04:05.210 medically sealed compressor all right 00:04:08.05000:04:08.060 regardless of whether that's a scroll or 00:04:10.21000:04:10.220 a reciprocating right herm means 00:04:13.69000:04:13.700 compressor fan is talking about to come 00:04:16.77000:04:16.780 the condenser fan on top of the outdoor 00:04:20.11000:04:20.120 unit and then common is this attached to 00:04:22.63000:04:22.640 one of your 120 volt legs and you have 00:04:24.61000:04:24.620 220 volt legs and make your 240 volt 00:04:27.81000:04:27.820 power for your outdoor unit all right so 00:04:30.88000:04:30.890 you're going to make sure you do all 00:04:31.72000:04:31.730 that with the power off and the wires 00:04:33.43000:04:33.440 isolated off the capacitor that's how 00:04:36.13000:04:36.140 you'd up hope you enjoy yourself we'll 00:04:38.02000:04:38.030 see you next time a c7 section
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